Relative newbie here though have lurked for quite a while and have learned much about my vintage Polks. My question is as follows: I have an opportunity to pick up a Fosgate Audionics 4100 amp but am not sure if it is a common ground amp or not. Amp is a 4 channel 60 x4 that can be configured in 3 or 2 channel mode. I have a very nice pair of vintage SDA SRS 2's and would like to use this amp to biamp the speakers but don't have the correct interconnect if needed. Much thanks for the help and comments regarding the amp.